61257645 has 24 divisors (see below), whose sum is σ = 106513056. Its totient is φ = 32568288.

The previous prime is 61257629. The next prime is 61257659. The reversal of 61257645 is 54675216.

It is a happy number.

61257645 is a `hidden beast` number, since 6 + 1 + 2 + 5 + 7 + 645 = 666.

It is not a de Polignac number, because 61257645 - 2⁴ = 61257629 is a prime.

It is a super-3 number, since 3×61257645³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13654 + ... + 17576.

It is an arithmetic number, because the mean of its divisors is an integer number (4438044).

Almost surely, 2^61257645 is an apocalyptic number.

It is an amenable number.

61257645 is a deficient number, since it is larger than the sum of its proper divisors (45255411).

61257645 is a wasteful number, since it uses less digits than its factorization.

61257645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4281 (or 4278 counting only the distinct ones).

The product of its digits is 50400, while the sum is 36.

The square root of 61257645 is about 7826.7263271434. The cubic root of 61257645 is about 394.2031577873.

The spelling of 61257645 in words is "sixty-one million, two hundred fifty-seven thousand, six hundred forty-five".